Google proposed to pay Oracle a percentage of Android revenue if Oracle could prove patent infringement of the mobile operating technology at an upcoming trial, but Oracle rebuffed the offer as too low, according to a court filing late on Tuesday.

Oracle Corp sued Google Inc in 2010, claiming the Internet search leader's Android technology infringed Oracle's Java patents. A trial is set for April 16 before District Judge William Alsup in San Francisco.

Oracle also sued for alleged copyright infringement. Oracle has contended that Google should pay hundreds of millions of dollars on that claim, which is separate from the patents.

Alsup asked both companies to come up with ways to streamline the trial, which is expected to last about 8 weeks. In response, Google proposed a deal: if Oracle succeeded in proving patent infringement, Google would not spend time fighting about damages if Oracle agreed to its figures.

Google offered to pay Oracle roughly $2.8 million in damages on the two patents remaining in the case, covering the period through 2011, according to a filing made jointly by the companies.

For future damages, Google proposed paying Oracle 0.5 percent of Android revenue on one patent until it expires this December and 0.015 percent on a second patent until it expires in April 2018.

According to Google, those damages figures matched what had been calculated by a court-appointed expert in the case.

Google makes Android available to handset manufacturers for free, but derives revenue from the ads it sells on the system.

In October, Google said that its mobile business was generating revenue at an annual run rate of $2.5 billion, though that business includes revenue from ads Google serves on Android devices as well as on Apple's iPhone.

Oracle said Google's offer was too low, and that Oracle would not give up the possibility of winning an injunction against Android.

"Oracle cannot agree to unilaterally give up its rights, on appeal and in this court, to seek full redress for Google's unlawful conduct," the company said in the filing.

Oracle acquired Java through its purchase of Sun Microsystems in 2010. Earlier this month, Oracle agreed to withdraw several claims after some of its patents were struck down by the U.S. Patent and Trademark Office.

In a court hearing on Wednesday, Alsup told the companies that any settlement should be reached by noon on April 13 at the latest, so that potential jurors would not have to make the trip to court.

However, the judge said that he was looking forward to the intellectual property trial if the companies could not reach an agreement.

"This is the World Series of IP cases," Alsup said.

The case in U.S. District Court, Northern District of California, is Oracle America, Inc v. Google Inc, 10-3561.

(Reporting by Dan Levine in San Francisco; Additional reporting by Alexei Oreskovic; Editing by Lisa Von Ahn and Tim Dobbyn)

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